JPH02305152A - Terminal equipment - Google Patents

Abstract

PURPOSE:To attain the transmission even in the B-channel busy state by providing a means detecting the B-channel busy state in a network and sending communication information in a D-channel packet automatically. CONSTITUTION:In the case of B-channel busy state, a B-channel busy state of a line is detected by a D-channel call control circuit 5 and when the busy state is detected, the call control for starting the use of B-channel is finished to apply call control for D-channel packet use start and a packet start signal is outputted to a packet selection circuit 4. In this case, the packet selection circuit 4 outputs a select A signal and a select B signal switching the connection of a selector A2 from the position of a B-channel control circuit 3 to the position of a D-channel packet control circuit 6 and switching a selector B7 from the position of a D-channel call control circuit 5 to the position of the D-channel packet control circuit 6 through the input of the packet start signal. Thus, even in the case of B-channel busy state, a video signal is able to be sent.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a terminal device, and more particularly to improvements in, for example, telephone devices and facsimile devices connected to an I5N and used for communication.

(Prior technology) ISDN (Integrated Digital Network) as a digital line network
service network), thereby providing voice and image services.

Various information and communication services based on various media such as data are expected. Typical examples of ISDN terminals include telephones and G4 facsimiles.

In ISDN, l-to-n wiring (bus wiring) is specified as one of the wiring forms for basic interfaces, and the interface consists of two β channels (ch) + one D channel (cb). Up to eight terminals can be connected to one line, and two of them can be used at the same time.

Here, Bch is an information channel for transferring user information. For example, in the case of a facsimile device as a communication terminal, conventionally, a facsimile device connected to an ISDN network transmits a video signal consisting of 1ffii image data using this channel. Transmit by Bch, transmission +1Ill
It is configured to transmit a control signal for performing the H procedure via Dch.

The same applies to telephone devices, and information signals and control signals are transmitted through Bch and Dch, respectively. That is, in an 11-talk device connected to an ISDN basic interface, conventionally, a signal consisting of voice data (voice signal), a control signal for performing transmission 1II1lif order,
They are configured to transmit via Bch and Dch, respectively.

(Problem to be Solved by the Invention) However, in conventional ISDN@ terminal devices of this type, if it is a facsimile device, the video signal that is the information to be transferred to the other party is transmitted through +3ch as described above. If the line is in a Bah busy state or if the other party's terminal is already communicating using Bch, the video signal cannot be transmitted. Therefore, it is necessary to wait until communication is possible, but simply waiting for the Bch busy state to be resolved is inefficient, and in addition, when the Bc
It is not easy to accurately know in advance whether the river will be available or not, and as a result, it often becomes difficult to establish communications.

Even if the ISDN terminal is a telephone device, its voice information is Bch.
The same thing can be said because it is a transmission, and the connected network is B.
ch If you are in a busy state or the other party's terminal is talking, you will not be able to make a call unless you interrupt the call. If you are asked to call back multiple times,
Even if the content of the call is simple (for example, a message), those who really desire the communication will have no choice but to spend a lot of effort and time on it.

SUMMARY OF THE INVENTION An object of the present invention is to provide an improved terminal device that allows transmission even when the B channel is busy.

(Means and effects for solving the problem) The present invention provides l5
I) A terminal connected to the N network, which detects the busy state of the B channel of the network and, in the case of the busy state, is equipped with a means for automatically transmitting communication information using D channel packets. , when the B channel is busy, transmission is automatically performed using the D channel packet.

Further, according to the present invention, the terminal connected to the ISDN basic interface has the function of detecting the busy state of 13 channels of the network, and the function of temporarily storing communication information in memory and transmitting it by D channel packet. By having this, it is possible to provide a terminal device that can be applied to message-like voice data that can be transmitted even when the B channel is busy.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a terminal device according to an embodiment of the present invention.

This embodiment is applied to a facsimile as a terminal device connected to an ISDN network, and shows a case where the terminal device is configured to transmit image data using ISDN 113 Dch packets.

In FIG. 1, reference numeral 1 indicates a video memory.

The video memory l records video data transmitted and received by the wooden terminal, and is composed of, for example, a RAM or a hard disk.

This apparatus has the above-mentioned video memory I, a communication control system as shown, and further includes necessary means (not shown) such as a reader unit, a printer unit, an operation display panel unit, etc., which are normally provided in a facsimile machine.

The communication control system includes a selector (A) 2, a Bch control circuit 3, a packet selection circuit 4, a Dch call control circuit 5, and a Dch
Packet control circuit 6, selector (B) 7 and communication +Iy
It consists of an Iv circuit 8 and has a function of automatically transmitting video data using Dch packets by detecting the Bch busy state of the network.

The selector (Δ) 2 selects the video memory l and B c h f by the select Δ signal output from the packet selection circuit 4.
A selective switching connection is made with the lXI911 circuit 3 or the Dch packet control circuit 6. In the above [3c), the control circuit 3 controls the transmission by Bch, and the packet selection circuit 4 controls the Dch row control circuit 5 and DC
Switching control of the selector (Δ) 2 and selector (B) 7 is performed by manual input of packet start No. 18 and packet end No. In output by the h-packet ustnl path 6, respectively.

The Dch IFF control circuit 5 performs call control of communications such as connection, disconnection, and dialing of lines by Dch, and the Dch packet control circuit 6 controls transmission by Dch packets.

The selector (B) 7 selects the communication control circuit 8 and Dc by inputting the select l-B signal output from the packet selection circuit 4.
h IFF Selects connection to fli control circuit 5 or Dch packet control circuit 6.

The communication control circuit 8 is connected to the ISDN network and performs tlJm of communication over the line.

When the selector (B) 7 is switched to the Dch call control circuit 5 side, the Dch I'F control signal is transmitted and received between the two.

between the video memory I and the selector (Δ) 2, between the selector (A) 2 and the 13ch control circuit 3, and between the B ch
The transmission paths between the control circuit 3 and the communication control circuit 8 transmit a video signal, a Bch video signal, and a 13ch video signal, respectively.
No. 18 signal path, and selector (△) 2 and Dc
h between the packet control circuit 6, between the Dart packet control circuit 6 and the selector (+3) 7, and between the selector (
B) The transmission paths between 7 and the communication control circuit 8 are as follows:
This is a signal path for a DCh video signal, a DC11 packet signal, and a Dch signal.

Furthermore, the operation of this device will be specifically explained with reference to FIG.

FIG. 2 is a flow chart diagram in the above embodiment.

In FIG. 1, in the initial state of the wooden terminal, the selector (Δ) 2 connects the video memory l and the Bch control circuit 3, and the selector (B) 7 connects the D Ch FPC1il1m circuit 5 and the communication Hit m circuit 8. are connected to each other.

When transmitting video data from a wooden terminal to a partner terminal, Dc
The hlFJ' control circuit 5 is connected to the line through the selector (B) 7 and the communication control circuit 8, and in this state, it first performs l+7 control to start using Bch.

That is, as in step 201 during video data transmission in FIG. 2, Dch call control for Bch is started, and step 202
Then, determine whether B ch is busy. Here, Bc)t
If Bcb is available, that is, Bcb is not busy, transmission is performed in accordance with case A1 of the flowchart for transmitting video data in FIG. (Steps 203 and 204
).

At this time, the video data stored in video memory 1 is
Image 1 image memory [→Selector (A) 2→Bch control circuit 3
- Communication control circuit 8 - Transmitted through the line route (step 203). Further, after the transmission of the video data is completed, the DC11 call control circuit 5 performs call control to end the heavy use of Bchl (step 204), and ends the transmission.

On the other hand, if 13ch is busy and unavailable, transmission is performed according to case 131 in FIG. That is, by using DC+1 packets, video data is transmitted even in 3Ch busy messages.

First, when this B ch is busy, I)
The lly control circuit 5 detects the Bch busy state of the line (Step 202), and if the busy state is detected,
Completed one call control for opening Bch Shikawa, l) c
Performs call control to start using h packets, and outputs a packet start signal to the packet selection circuit 4 (step 2)
05). In this case, upon input of the packet start signal, the packet selection circuit 4 changes the connection of the selector (A) 2 from the 3ch control circuit 3 side to the Dch packet control circuit 6 side, and changes the connection of the selector B7 to the Dch packet control circuit 6 side. A select A signal and a select B signal for switching from the control circuit 5 side to the Dch baquerato control circuit 6 side are output. This switches and controls the respective connection states.

As a result, the video data is transferred from the video memory 4I to the selector (
Δ)2→Dch packet control circuit 46→selector (B)
7-Communication control circuit 8→It is transmitted through the line (step 206).

In this way, according to the above, by providing the line 1'3ch busy state detection device and the Dch packet transmission device, it is possible to transmit video No. 13 using the Dch packet when the Bch is busy. can.

Transmission is performed as described above, and after the transmission of the video data is completed, the Dch packet control circuit 6 outputs a packet end signal. In response to the input of the packet end signal, the packet selection circuit 4 changes the connection of the selector (A) 2 from the Dch packet control circuit 6 side to the Bc11 control circuit 43 side, and changes the connection of the selector (B) 7 to the Dc kx packet control side. circuit 6
Dch call from side; returns to I11 control circuit 5 side. Therefore, the D e 111I il+lI control circuit 5
Performs channel control to terminate use of channel packets (step 20)
7), the transmission ends.

The above describes transmission, but when a tree terminal becomes a receiving terminal, the following operation occurs.

In other words, in the case of reception, the same procedure is followed, and when Bch is used, the flow of video data is as follows: line-communication control circuit 8 → Bch control circuit 3 → selector (Δ) 2 → video memory l. When using Dch packets, line - communication control circuit 8 → selector (+3) 7 → Dch packet +
Iyl 11 circuit 6 → selector (Δ) 2 → video memory l
This will be the route.

FIG. 3 and subsequent figures show embodiments of a terminal device in the value form of the present invention.

That is, this shows an example of a telephone device configured to use the Dcb packets of the ISDN network. By having a function to detect a busy state, a function to temporarily store voice as data in a memory and transmit it as a Dch packet, and a function to create voice data accumulated in memory, it is possible to detect whether the line is busy or not. Even in the state, audio data is transmitted using D c j + packets.

First, 3rd f! 1 is a block diagram of the embodiment device showing its basic principle, similar to the lt diagram above.

As shown in the figure, the wooden terminal has a handset 31 and a codec 32, and also has a selector (A) 2, a B ch
nlln circuit 3, bucket)/selection circuit 41, 1) ch call control circuit 51. Dch packet control circuit 6, selector (
B) 7 and (n Il, lI control circuit 8), and further includes a memory 33 used for temporarily storing audio as data.

The operation of each part of the block diagram shown in FIG. 3 will be explained.

1. The handset 31 converts the user's voice into an electrical signal, outputs an analog audio signal, and also uses a codec 32.
Converts the analog audio No. 16 output by the converter into audio. The codec 32 receives the analog audio signal output from the handset 31, outputs a digital audio signal by A/D conversion, and converts the digital audio signal output from the selector (A) 2 into a D/A converter. output as an analog audio signal.

The selector (A) 2 selects the codec 32 and the +
3 c h 1ilJI! A switching connection is made between the circuit 3 and the memory 33.

B c h ff1J control circuit 3 is the same as above, F3ch
The packet selection circuit 41 manually selects the select A signal and the select B signal by using the packet start signal and packet end signal δ output by the Dch call control circuit 51 and the Dch packet control circuit 6, respectively. Output the signal, selector (A) 2 and selector (B)
7.

The memory 33 is for storing audio data, and is
It consists of an AM, tape, or hard disk, and is used to temporarily store audio data.

The DcblFJ' control circuit 51 performs call control of communication such as connection, disconnection, and dialing of the Dch line, and in this embodiment, has a function of sending a memory selection signal to the packet selection circuit 41.

The Dch packet control circuit 6, which controls the transmission of Dch packets, is connected to the selector (Δ) 2 via the memory 33.

The selector (B) 7 selects the communication control circuit 8 and 1 .
) Selects connection to the ch call control circuit 51 or the Dch packet control circuit 6. Note that the communication control circuit 8 is
11; As in the first embodiment, communication is performed on the lLi1 line.

Next, the operation of the above embodiment will be explained with reference to FIGS. 4 and 5.

FIG. 4 is a flowchart showing the operation during audio data transmission in the above embodiment.

In the initial state, selector (A) 2 in FIG.
connects the codec 32 and the Bcb control circuit 3, and the selector (B) 7 connects the Dcb call control circuit 51 and the communication control circuit 8, respectively.

When transmitting voice data, the Dch call control circuit 5! teeth,
It is connected to the line through the selector (B) 7 and the communication control circuit 8, and as before, first, step 401 in FIG.
Performs one-hit control to start using B ch. Then, step 402 is executed.

Here, if [3c)t is available, the call is made according to the case Δ1 of flowchart 1 during audio data transmission in FIG. 4. At this time, the voice data is transmitted to the handset 3.
'' - codec 32 - selector (Δ) 2 - Bch control circuit 3 - communication control circuit 8 - A call is made in both directions of the line (step 403). Further, after the transmission of voice data is completed, the DCh call control circuit 51 performs call control to end the use of B c k1 (step 404), and ends the transmission.

However, if 13ch is busy and unavailable,
Case B of the flowchart during audio data transmission in Figure 4
Transmission is performed along the ll.

That is, at this time, the D c b call control circuit 51
Detects the Bch busy state of the line, terminates call control for starting I3G 11 use, and outputs a memory selection signal. Here, the packet selection circuit 41 outputs a select A signal in response to the input of the memory selection signal, and selects the selector (
A) Connect 2 from the B ch control circuit 3 side to the memory 3
Switch to side 3.

In this way, the sender's voice data is transferred to the handset 31-
It is transmitted through the codec 32 - selector (Δ) 2 - memory 33 and stored in the memory 33 (step 405).
). When the storage in the memory 33 is completed, the selector (
A) 2 switches from the memory 33 to the B c k1 control circuit 34 side.

Next, the DC) 1 tap control circuit 51 performs call control to start using the Dch packet (step 406), and outputs the bucket start No. In to the packet selection circuit 41. Upon receiving the packet start signal, the packet selection circuit 4 outputs a select B signal for switching the connection of the selector (B) 7 from the Dch call control circuit 51 side to the Dch packet control circuit 6 side. As a result, the audio data stored in the memory 33 is transferred from the memory 33 to the Dch packet 1i+
It will be transmitted along the following route: control circuit 6 → selector (B) 7 → communication control circuit 8 → line (step 407).

In this way, in this example, by providing the network's [3c)t busy state detection function, Dcb packet transmission function, and audio storage and playback function, voice data is temporarily stored in the memory in the Bch busy state. Audio data can be transmitted using single-line communication in which the audio data is stored and transmitted using Dch packets, and furthermore, as described later, the transmitted audio data is stored in the memory of the receiving terminal and played back later. . According to the above, by using Dch packets, video data can be transmitted even in the Bch busy state, and there is no need for interruptions as in the conventional case.

After the transmission of the audio data is completed, the Dch packet control circuit 6 outputs a packet end signal. The packet selection circuit 41 connects the selector (B) 7 to the I)c kl packet control circuit 6 by inputting the packet end signal.
from the side to the Dch call control circuit 511m. And Dc
The hlFF control circuit 51 performs call control 17 to end the use of DC1 (step 408), and ends the communication.

FIG. 5 is a flowchart showing the reception operation.

In FIG. 5 showing the procedure when receiving audio data, in the case of reception, if B ch is available, the processing is performed in the same procedure as the transmission in FIG. 4 above (steps 501 to 504).

On the other hand, if the Bch is busy, the Dch call control circuit 51 performs call control to start the Dch bucket daily history (step 505), and connects the selector (B) 7 from the DC11 call control circuit 51 side to the Switch to the packet control circuit 6 side and transfer the audio data to the line-communication control circuit 8-selector (B)
7-Dch packet ipIn is stored in the memory 33 through the route 6-memory 33 (step 506). After the audio data has been transmitted using the Dch packet, the selector (
B) Connect 7 from the Dch packet generation circuit 6 side to the Dc
h, switch to the call control circuit 51 side, that is, return to the D
The ch call control circuit 51 performs call:I11 control to end the use of the Dch bucket (f order 507), and ends the communication.

After the above accumulation, audio reproduction can be performed as follows. That is, the receiver transfers the audio data stored in the memory 33 from the selector (Δ) 2 to the memory 33fl! from the B ch control circuit 3! By switching to , the data is reproduced in the order of memory 33 - selector (A) 2 - codec 32 - handset 31.

As described above, audio data transmitted from the other party can be stored and played back.

The above configuration is particularly suitable for, but not limited to, telephone devices.

(Effects of the Invention) According to the present invention, communication information can be transmitted even in a Bch busy state by using I)ah packets, and the terminal device according to the present invention can be applied as a facsimile device or a telephone device, It is possible to provide a facsimile device and a telephone device α that have the function of transmitting video data and audio data even when Bch is busy, and there are effects such as making these ISDN terminals more versatile. There is.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention. Figure 2 is a flowchart for transmitting video data.
FIG. 3 is a block diagram showing an embodiment of the pond of the present invention, FIG. 4 is a flowchart for transmitting audio data, and FIG. 5 is a flowchart for receiving audio data. l...Video memory, 2...Selector A, 3...B
c tt control circuit, 4, 41... Packet selection circuit, 5, 51... Dch call control circuit, 6... Dch packet control circuit, 7... Selector B, 8... Communication control circuit, 31... handset, 32... codec,
33...Memory.

Claims (1)

[Scope of Claims] 1. A terminal connected to an ISDN network, which detects a busy state of the B channel of the network and, in the case of the busy state, automatically transmits communication information using a D channel packet. A terminal device comprising: 2. The terminal device according to claim 1, wherein the communication information is video data and the terminal is a facsimile device. 3. A terminal connected to the ISDN basic interface, characterized by having the function of detecting the busy state of the B channel of the network, and the function of temporarily storing communication information in memory and transmitting it by D channel packets. Terminal device. 4. Claim 3, wherein the terminal is a telephone device, and the memory temporarily stores voice as data.
The terminal device described. 5. The terminal device according to claim 4, wherein the telephone device has a function of accumulating voice data transmitted by D channel packets from the transmitting side in a memory and regenerating the accumulated voice data.